Encapsulation process
Abstract
Abstract A PROCESS FOR ENCAPSULATING AN ACTIVE MATERIAL IN A SHELL COMPOSITION IN WHICH THE CAPSULE COMPOSITION IS FORMED BY DISPERSING AN ACTIVE MATERIAL AND A SHELL COMPOSITION IN A SOLVENT FOR THE SHELL COMPOSITION. CAPSULES ARE PREPARED BY FORMING THE CAPSULE COMPOSITION INTO PARTICLES CONTAINING THE ACTIVE MATERIAL AS A DISPERSED PHASE IN A SOLUTION OF THE SHELL COMPOSITION AND REMOVING THE SOLVENT FROM THE SHELL COMPOSITION SOLUTION. A LOWER MOLECULAR WEIGHT POLYGLYCOL IS EMPLOYED TO DESOLVENTIZE THE SHELL COMPOSITION. REMOVAL OF SOLVENT IS CONDUCTED WITHOUT EXTRACTING A SUBSTANTIAL PROPORTION OF ACTIVE MATERIAL FROM THE CAPSULES. IF DESIRED, THE DESOLVENTIZING OPERATION CAN BE ACCELERATED BY FIRST DISPERSING THE CAPSULE COMPOSITION IN A VISCOUS WHITE MINERAL OIL IN WHICH THE CAPSULE COMPOSITION FORMS DISCRETE PARTICLES, AND THEN ADMIXING THE RESULTING MIXTURE WITH AN ANHYDROUS POLYGLYCOL CONTAINING A SUFFICIENT QUANTITY OF MUTUAL SOLVENT TO RENDER THE MINERAL OIL AND POLYGLYCOL AT LEAST PARTIALLY COMPATIBLE.
Inventors
- 👤 L Balassa
Bibliographic Details
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